Cylinder Block (1-01) Section 1 - Cylinder Block - Group 01 M11 Page 1-8 Pipe Plugs - Removal Use the appropriate size hex key wrench to remove all of the pipe plugs. Viscosity Sensor - Removal If the viscosity sensor was not removed during engine disassembly, use a 7/16 inch socket with a ratchet and extension and remove the viscosity sensor. Dowel Pins - Removal Use dowel pin extractor, Part No. ST-1134, to remove the following dowel pins: Two cylinder head alignment dowel pins Three cam follower alignment dowel pins